I am sure this will be an issue with a lot of super partisans. My neighbor still believes that Obama was not eligible for being president. I have no idea what evidence could convince these people otherwise.
I think the people who are spreading these rumors are playing a very dangerous game. There seems to be a trend to spread doubts about elections, FBI investigations, CIA findings and others without providing real evidence. This is a short term benefit for the people spreading the rumors but I wonder if they are starting something that may spin out of control at some point.
You talk like you have been living under a rock for the past three years. Trump got politically famous through the birther movement. Most of the people who support Trump believe in a lot of these rumors, as you call them, or fake news, as the rest of the world now call them.
Fake news has been a big problem around the world for the past few years and the media has acknowledged and widely publicised it as a problem since 2016. Since a lot of people get their news from Facebook now, and Facebook has been algorithmically recommending fake news articles to people, Facebook has gotten a lot of flak for it, including the CEO being called to testify about it in Congress. A lot of people are now trying to figure out how to combat fake news and this has been on the news and this website for the last few years.
"A lot of people are now trying to figure out how to combat fake news and this has been on the news and this website for the last few years."
You are pretty naive if you think this nonsense will be fixed in a substantial way. Platforms like Facebook and Twitter are dependent on outrage and will not do much to stop it. Yes, there are some people here and in the news discussing these issues but at the same time there are are many more people making a good living off perpetuating propaganda. The most that will happen to Facebook will be a lot of hot air and maybe a slap on the wrist.